> [11:21:01 ERROR]: Could not pass event InventoryClickEvent to FactionsCore v1.0-SNAPSHOT
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server.jar:git-TacoSpigot-unknown]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[server.jar:git-TacoSpigot-unknown]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-TacoSpigot-unknown]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:498) [server.jar:git-TacoSpigot-unknown]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:478) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1733) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-TacoSpigot-unknown]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_212]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_212]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:808) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:384) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:745) [server.jar:git-TacoSpigot-unknown]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:647) [server.jar:git-TacoSpigot-unknown]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.NullPointerException
at com.optic.patches.commands.CmdBuy.onClick(CmdBuy.java:80) ~[?:?]
at sun.reflect.GeneratedMethodAccessor59.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[server.jar:git-TacoSpigot-unknown]
... 16 more